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contrib-munin/plugins/lxc/lxc_net
2015-08-03 15:37:42 +02:00

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#!/bin/sh
: << =cut
=head1 NAME
lxc_net - Munin plugin to graph traffic of active LXC containers.
=head1 APPLICABLE SYSTEMS
LXC container with "lxc.network.type=veth" and "lxc.network.veth.pair" settings.
=head1 CONFIGURATION
env.lxcpath - Set the path where LXC containers are stored, default: /var/lib/lxc
env.exclude - Removing containers from graphs, default: empty
[lxc_net]
env.lxcpath /var/lib/lxc
env.exclude container1 container2
=head1 INTERPRETATION
This plugin reads a "lxc.network.veth.pair" setting from "config" file of each container,
because lxc-start command creates a random named veth device without the setting.
If your xen config (/var/lib/lxc/GUEST_NAME/config does not contain this parameter,
then you have to fill it, because if every guest restart generate new device name, then the graph will be useless
( example config : lxc.network.veth.pair = vethsamba )
=head1 AUTHOR
mitty mitty@mitty.jp
=head1 LICENSE
2-clause BSD License
=head1 MAGIC MARKERS
#%# familiy=auto
#%# capabilities=autoconf
=cut
. $MUNIN_LIBDIR/plugins/plugin.sh
lxcpath=${lxcpath:-/var/lib/lxc}
if [ "$1" = "autoconf" ]; then
if [ ! -r /proc/net/dev ]; then
echo "no (/proc/net/dev cannot be read)"
exit 0
fi
if [ ! -e "$lxcpath" ]; then
echo "no ($lxcdir is not present)"
exit 0
fi
echo yes
fi
actives=""
for guest in `ls $lxcpath`; do
if [ `echo $exclude | grep -c "\b$guest\b"` -eq 1 ]; then
continue;
fi
if [ -f "$lxcpath/$guest/config" ]; then
devices=`grep '^lxc\.network\.veth\.pair[ \t]*=[ \t]*' $lxcpath/$guest/config | \
awk '{ split($0, a, /=/); gsub(/[ \t]/, "", a[2]); print a[2]; }'`
if [ -n "$devices" ]; then
for device in $devices; do
device_re=`echo $device | sed -e 's/\./\\\\./g'`
if [ `grep -c "^ *$device_re:" /proc/net/dev` -eq 1 ]; then
actives="$actives $guest"
eval "dev_$(clean_fieldname $guest)=$device"
fi
done
fi
fi
done
if [ "$1" = "config" ]; then
echo "graph_title Network traffic"
echo "graph_args --base 1000"
echo "graph_vlabel bits in (-) / out (+) per ${graph_period}"
echo "graph_category lxc"
echo "graph_info This graph shows the traffic of active LXC containers."
for guestname in $actives; do
guest=$(clean_fieldname $guestname)
device=$(eval 'echo $dev_'$guest)
bps="U"
if [ -r /sys/class/net/$device/speed ]; then
bps=$(cat /sys/class/net/$device/speed)
bps=$(($bps * 1000 * 1000))
fi
echo "${guest}_down.label $guestname"
echo "${guest}_down.type DERIVE"
echo "${guest}_down.graph no"
echo "${guest}_down.cdef ${guest}_down,8,*"
echo "${guest}_down.min 0"
echo "${guest}_down.max $bps"
echo "${guest}_up.label $guestname"
echo "${guest}_up.type DERIVE"
echo "${guest}_up.negative ${guest}_down"
echo "${guest}_up.cdef ${guest}_up,8,*"
echo "${guest}_up.min 0"
echo "${guest}_up.max $bps"
done
exit 0
fi
for guest in $actives; do
guest=$(clean_fieldname $guest)
device=$(eval 'echo $dev_'$guest)
device_re=`echo $device | sed -e 's/\./\\\\./g'`
line=`grep "^ *$device_re:" /proc/net/dev`
echo -n "${guest}_down.value "
echo $line | awk '{
split($0, a, /: */);
print $2;
}'
echo -n "${guest}_up.value "
echo $line | awk '{
split($0, a, /: */);
print $10;
}'
done